Sell a UK residential property at a gain and, if tax is due, you must report it and pay CGT on account within 60 days of completion. This calculator works out your gain after buying and selling costs, applies private residence relief for any period you lived there (plus the final 9 months), deducts the £3,000 annual exempt amount, taxes the rest at 18% and 24% based on your other income, and gives you the exact deadline date. It also tells you when no 60-day return is needed at all.
Estate agent fees, legal fees and other costs of the sale.
Stamp duty, legal fees and survey fees when you bought the property.
Extensions, loft conversions and other capital works still reflected in the property. Not repairs, redecoration or maintenance.
Enter 0 for a pure buy-to-let or second home. The final 9 months of ownership are added automatically if you ever lived there.
Salary, self-employment profit, rental profit and other income for 2026/27. This sets how much of the gain is taxed at 18% rather than 24%.
The 60 days run from legal completion, not exchange of contracts.
If other gains this tax year have used some of your £3,000 exemption.
The 60-day clock starts at completion. The payment is on account: your final CGT position is settled through Self Assessment, where the rate split can change if your income for the year turns out differently. Non-UK residents must file a 60-day return even when no tax is due.